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  • 1.
    Tohidi, Yaser
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Hesamzadeh, Mohammad R.
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Ostman, Kristina
    KTH, School of Electrical Engineering (EES), Electric Power and Energy Systems.
    Reactive Coordination of Transmission-generation Investment Planning2015In: 2015 12TH INTERNATIONAL CONFERENCE ON THE EUROPEAN ENERGY MARKET (EEM), 2015Conference paper (Refereed)
    Abstract [en]

    This paper discusses the reactive coordination of generation and transmission planning in a competitive electricity market. The transmission planner is assumed as a social cost minimizing entity and the behavior of generators is modeled as the Nash equilibrium of a strategic game. Reactive coordination forms a mixed-integer optimisation problem which can be solve by commercially available softwares. This problem is solved for two cases of with and without transmission charges. Efficient coordination of transmission and generation planning is considered as the benchmark in this study. The developed model is implemented for a 6-node illustrative example and IEEE-RTS96 test system and the results are compared.

  • 2. Hoff-Elimari, E.
    et al.
    Bardi, A.
    Matti, S.
    Östman, Kristina
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Collective action problems: Disentangling possible feedback loops between government policies and the public’s value-change2014In: European Journal of Government and Economics, E-ISSN 2254-7088, Vol. 3, no 1, p. 24-46Article in journal (Refereed)
    Abstract [en]

    Solving collective action problems, such as poverty reduction or climate change, depends on interactions between governments' and voters' preferences regarding pro-social actions. This paper examines whether the overall direction of change in pro-social public policy precedes public value-change, rather than the other way around. We examine change in the public’s pro-social values in six European countries, as measured by the European Social Survey (ESS) during 2002-2012. In these countries, we conducted an expert survey to rate governmental policy that expresses these values over the same period, thereby examining value-change in governmental policy. The chronological comparison of value-change of the public with that of respective governments suggests that changes in pro-social government policies may drive public value-change rather than vice versa. This complements previous studies focused on the opinion-policy connection. Possible political implications are discussed. The promising findings of this initial study point to the importance of conducting larger-scale future studies. 

  • 3.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad Reza
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Transmission pricing in interconnected systems - A case study of the Nordic countries2014In: ENERGYCON 2014 - IEEE International Energy Conference, IEEE Computer Society, 2014, p. 1480-1486Conference paper (Refereed)
    Abstract [en]

    With renewable energy production increasing around the world, there is a growing need for interconnection to balance intermittent supply. This cross-border trade of electricity requires navigating in multiple regulatory regimes and market designs, not least when it comes to transmission pricing. By considering the Nordic countries as a case study, this paper investigates the impact of different transmission pricing regimes on investment decisions for renewable energy production. A generation expansion problem for wind power is simulated with the current transmission prices in Sweden, Finland, Norway, and Denmark applied, along with a baseline case with no transmission pricing differences, to achieve a quantitative comparison. The importance of coherent transmission pricing is demonstrated through the large discrepancy in wind power investments resulting from the two cases studied.

  • 4.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Pricing electric-power transmission: The Swedish methodology and a new approach2013In: 2013 4th IEEE/PES Innovative Smart Grid Technologies Europe (ISGT EUROPE), IEEE , 2013, p. 6695429-Conference paper (Refereed)
    Abstract [en]

    Electricity systems are changing rapidly worldwide, and transmission pricing needs to adapt. As renewable energy production increases, it is vital that the costs for transmission are recovered while recognising the special characteristics of different energy sources. In this paper, a new transmission pricing approach is presented and compared to the approach currently used in Sweden. By calculating nodal transmission tariffs based on marginal transmission costs and incorporating uncertainty in demand and generation, the new approach caters for a changing electricity system. To assess their impacts on renewable energy production, the two methodologies are applied to a case study mimicking the Swedish system with an increased wind power penetration. The results show that location and generation type can strongly influence the transmission tariffs, and that charging renewable energy producers less could be a least-cost option.

  • 5.
    Östman, Kristina
    et al.
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    Hesamzadeh, Mohammad
    KTH, School of Electrical Engineering (EES), Electric Power Systems.
    The suitability of current transmission pricing systems for increased renewable energy production2013In: 2013 IEEE Power and Energy Society General Meeting (PES), IEEE , 2013, p. 6672674-Conference paper (Refereed)
    Abstract [en]

    As renewable electricity generation increases around the world, transmission networks are forced to adapt. The growing need for balancing services and long transmission distances lead to increased costs, which somehow need to be recovered. This paper considers the transmission pricing methodologies in four countries and assesses them against optimal pricing methodologies as defined in academic literature. The countries Australia, Spain, Great Britain and Sweden, with their different renewable energy potential and energy policies, provide a suitable snapshot of transmission pricing today. While they boast different levels of maturity, none of the methodologies fulfill all identified conditions for effective transmission prices with increased amounts of renewable electricity.

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